package com.intellij.structuralsearch.plugin.ui;

import com.intellij.notification.NotificationGroup;
import com.intellij.openapi.application.ModalityState;
import com.intellij.openapi.progress.ProgressIndicator;
import com.intellij.openapi.progress.ProgressManager;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.ui.MessageType;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.openapi.wm.ToolWindowId;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiNameIdentifierOwner;
import com.intellij.structuralsearch.*;
import com.intellij.structuralsearch.impl.matcher.MatchResultImpl;
import com.intellij.structuralsearch.plugin.StructuralSearchPlugin;
import com.intellij.usageView.UsageInfo;
import com.intellij.usages.Usage;
import com.intellij.usages.UsageInfo2UsageAdapter;
import com.intellij.util.Alarm;
import com.intellij.util.ObjectUtils;
import com.intellij.util.Processor;

/**
 * Created by IntelliJ IDEA.
 * User: Maxim.Mossienko
 * Date: Mar 15, 2004
 * Time: 4:49:07 PM
 * To change this template use File | Settings | File Templates.
 */
public class SearchCommand {
  protected UsageViewContext context;
  private MatchingProcess process;
  protected Project project;

  public SearchCommand(Project _project, UsageViewContext _context) {
    project = _project;
    context = _context;
  }

  public void findUsages(final Processor<Usage> processor) {
    final ProgressIndicator progress = ProgressManager.getInstance().getProgressIndicator();

    final MatchResultSink sink = new MatchResultSink() {
      int count;

      public void setMatchingProcess(MatchingProcess _process) {
        process = _process;
        findStarted();
      }

      public void processFile(PsiFile element) {
        final VirtualFile virtualFile = element.getVirtualFile();
        if (virtualFile != null)
          progress.setText(SSRBundle.message("looking.in.progress.message", virtualFile.getPresentableName()));
      }

      public void matchingFinished() {
        findEnded();
        progress.setText(SSRBundle.message("found.progress.message", count));
      }

      public ProgressIndicator getProgressIndicator() {
        return progress;
      }

      public void newMatch(MatchResult result) {
        UsageInfo info;

        if (MatchResult.MULTI_LINE_MATCH.equals(result.getName())) {
          int start = -1;
          int end = -1;
          PsiElement parent = result.getMatchRef().getElement().getParent();

          for (final MatchResult matchResult : ((MatchResultImpl)result).getMatches()) {
            PsiElement el = matchResult.getMatchRef().getElement();
            final int elementStart = el.getTextRange().getStartOffset();

            if (start == -1 || start > elementStart) {
              start = elementStart;
            }
            final int newend = elementStart + el.getTextLength();

            if (newend > end) {
              end = newend;
            }
          }

          final int parentStart = parent.getTextRange().getStartOffset();
          int startOffset = start - parentStart;
          info = new UsageInfo(parent, startOffset, end - parentStart);
        }
        else {
          PsiElement element = result.getMatch();
          if (element instanceof PsiNameIdentifierOwner) {
            element = ObjectUtils.notNull(((PsiNameIdentifierOwner)element).getNameIdentifier(), element);
          }
          info = new UsageInfo(element, result.getStart(), result.getEnd() == -1 ? element.getTextLength() : result.getEnd());
        }

        Usage usage = new UsageInfo2UsageAdapter(info);
        processor.process(usage);
        foundUsage(result, usage);
        ++count;
      }
    };

    try {
      new Matcher(project).findMatches(sink, context.getConfiguration().getMatchOptions());
    }
    catch (final StructuralSearchException e) {
      final Alarm alarm = new Alarm();
      alarm.addRequest(
        new Runnable() {
          @Override
          public void run() {
            NotificationGroup.toolWindowGroup("Structural Search", ToolWindowId.FIND, true)
              .createNotification(SSRBundle.message("problem", e.getMessage()), MessageType.ERROR).notify(project);
          }
        },
        100, ModalityState.NON_MODAL
      );
    }
  }

  public void stopAsyncSearch() {
    if (process!=null) process.stop();
  }

  protected void findStarted() {
    StructuralSearchPlugin.getInstance(project).setSearchInProgress(true);
  }

  protected void findEnded() {
    if (!project.isDisposed()) {
      StructuralSearchPlugin.getInstance(project).setSearchInProgress(false);
    }
  }

  protected void foundUsage(MatchResult result, Usage usage) {
  }
}